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United States Patent | 5,660,449 |
Higashimata ,   et al. | August 26, 1997 |
A braking force control apparatus for use with an automotive vehicle supported on road wheels each of which has a wheel cylinder for applying a braking force to the corresponding road wheel in response to a fluid pressure introduced thereto. The fluid pressure is controlled by a solenoid valve which is movable between open and closed positions in response to a control signal having a variable duty ratio. The duty ratio of the control signal is changed at predetermined intervals of time to move the solenoid valve in a plurality of steps toward the closed position.
Inventors: | Higashimata; Akira (Hadano, JP); Tsutsumi; Junji (Isehara, JP); Ito; Ken (Machida, JP) |
Assignee: | Nissan Motor Co., Ltd. (Yokohama, JP) |
Appl. No.: | 637393 |
Filed: | April 25, 1996 |
Apr 28, 1995[JP] | 7-106369 |
Current U.S. Class: | 303/156; 303/157; 701/82 |
Intern'l Class: | B60T 008/58 |
Field of Search: | 303/156,157,158,113.1,119.1,119.2 364/426.02 251/121,210,129.05,129.08 |
4898361 | Feb., 1990 | Bender et al. | 251/129. |
5303988 | Apr., 1994 | Okubo | 303/156. |
5328254 | Jul., 1994 | Youngblood | 303/156. |
5462253 | Oct., 1995 | Asthana et al. | 251/129. |
5571248 | Nov., 1996 | Seetharaman et al. | 251/129. |